理不尽

1. Origins, structure, and basic meaning

• Structure: 理不尽 is read as りふじん and is a noun and na-adjective for something unreasonable or unfair because it lacks a justifiable basis.
• Basic usage: Use 理不尽だ as a predicate and 理不尽を感じる for experiencing or perceiving unfairness.

2. Common pitfalls and similar expressions

• Lack of reason and unfairness
  • Being blamed 理由もなく is judged contrary to fairness and reasonable justification.
• Focus beside 不合理
  • 不合理 readily concerns logical inconsistency or inefficiency, while 理不尽 strongly conveys unjust demands or treatment that a person cannot reasonably accept.